Cologne's local newspaper Der Express reported that a group of thugs had planned a "manhunt" for asylum seekers.
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The scale of the Cologne assaults has shocked Germany and put a spotlight on the 1.1 million asylum seekers who arrived in the country last year.
It has also fuelled fear, with a poll published by the Bild am Sonntag newspaper saying that 39 per cent of those surveyed felt police did not provide sufficient protection, while 57 percent did.
Police said late on Sunday that more than a week on from New Year's Eve, some 516 complaints had now been lodged, including 40 per cent that are related to sexual assault.